Me, in your situation, i'd tell them...i'd explain that it has become a problem for you and you have recognised it as such and are on a path of action, AA, support groups, change of lifestyle...tell them it is early days and you would so value their support as you consider them as part of the family..or something like that.
**** wow that was quick i hadn't finished editing, good idea to ask your group and pray on it...good luck with whatever you decide:-)